smart-bottle.ino
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// Include the library to manage better the ultrasonic sensor
#include <Ultrasonic.h>

// Define the pins of ultrasonic sensor
Ultrasonic ultrasonic(12, 14);

// Define the variables 
int led_red = 4;
int led_green = 5;
int buzzer = 13;

// Define a void to get the Distance and notify the user when the water reach zero or low level
void getDistance() {
  float distanceSensor = ultrasonic.distanceRead();
  float value = distanceSensor; // Read the value of ultrasonic
  
  // Init a conditional, if the value isnan print Failed to Read the data

  if (isnan(distanceSensor)) {
    Serial.println("Failed To Read the data");
    return;
  }

  // Init a conditional, based in the measures of the bottle, when it reach some value do some action

  if (value > 17) {
    digitalWrite(led_red, HIGH); //  Turn on the Red LED 
    digitalWrite(led_green, LOW); // Turn Off the Green LED
    tone(buzzer, 540,1000); // Beep the buzzer for 1 second
  } else {
    digitalWrite(led_green, HIGH); // Turn on the Green LED
    delay(1000); // Wait 1 second
    digitalWrite(led_red, LOW); // Turn off the Red LED
    //tone(buzzer, 523, 500); // Optional: Beep the Buzzer
  }

  Serial.print("Distance: "); // Print in serial the follow text
  delay(1000); // Wait 1 second
  Serial.print(value); // Print in Serial the value of the distance
  delay(1000); // Wait 1 second
  Serial.println(); // Line Break on Serial
  delay(1000); // Wait 1 second

  /* Advisory: It's important to test with the delays.
     because is probably the Serial and the ide in general
     can be stucked by the among of data every second */
}

void setup() {
  Serial.begin(9600); // Init the Serial in 9600 baud
  pinMode(led_red, OUTPUT); // Red Led as OUTPUT
  pinMode(led_green, OUTPUT); // Green Led as OUTPUT
  pinMode(buzzer, OUTPUT); // Buzzer pin as OUTPUT
}

void loop() {
  getDistance(); // Call the function in loop
}

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